Boston Dynamics introduced WildCat, a wireless version of Cheetah, on the group's YouTube channel. The robot clocks in at a top speed of 16 mph, slower than its wired predecessor, but still faster than many humans. WildCat can run a less-than-four-minute mile.

Without a cord, the new generation of robot can run outside of the lab.

Boston Dynamics' video of WildCat in action shows it running in a parking lot. WildCat uses "bounding and galloping gaits" and can run on all types of flat terrain, the group noted in the description on YouTube, and can both move in a straight line and cut turns. Its motor noticeably hums.

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